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30 April 1997 <br /> AGE-NC Project No. 97-0326 <br /> Page 2 of 3 <br /> 3.3. LABORATORY ANALYSIS <br /> Selected soil samples will transmitted to a state-certified laboratory and analyzed for total petroleum' <br /> hydrocarbons quantified as gasoline(TPH-g)and volatile aromatics (benzene, toluene,ethylbenzene <br /> and xylenes: BTE&X) with methyl tertiary-butyl ether (MTBE) in accordance with EPA methods <br /> 8015m and 8020, respectively. The laboratory report, testing methods, laboratory quality <br /> assurance/quality control (QA/QC) reports and sample chain-of-custody documentation will be <br /> presented in a report with the findings. <br /> 4.0. PROCEDURES <br /> 4.1. PROBING AND SAMPLING <br /> The following procedures will be performed for the installation of probe borings: <br /> 1. Notify the PHS-EHD at least 48 hours prior to commencement of any work. <br /> 2. Advance four(4) soil probe borings at the site at an angle of approximately 25° from vertical <br /> to depths of approximately 15 to 20 feet using a van-mounted Geoprobe soil probing unit <br /> equipped with 1.25-inch diameter rods. The proposed probe boring locations are depicted on <br /> Figure 2. <br /> 3. Decontaminate sampling equipment in an Alconox solution and rinse with water prior to <br /> each sampling run. <br /> 4. Obtain soil samples at 5-foot intervals, beginning at 10 feet bsg, using a Geoprobe soil <br /> sampling assembly pre-loaded with four 1.125-inch by 6-inch brass sleeves. <br /> 5. Preserve soil samples in the second brass sleeve by covering both ends with Teflon sheets, <br /> capping, and sealing with tape. <br /> 6. Label and log samples on a chain-of-custody form. <br /> 7. Monitor soil sample duplicates for the presence of volatile organics using a photo-ionization <br /> detector (PID) pre-calibrated to isobutylene. <br /> 8. Log soil sample duplicates in accordance with the Unified Soil Classification System. <br /> 9. Store samples in a chilled container and transport to a State-certified laboratory for analysis. <br /> Selected samples will be analyzed for TPH-g, BTE&X and MTBE in accordance with EPA <br /> methods 8015m and 8020, respectively. <br /> 10. Backfill each probing to surface grade using Portland Cement. <br />